title: Plasmon single- and multi-quantum excitation in free metal clusters as seen by photoelectron spectroscopy.
abstract: Plasmons are investigated in free nanoscale Na, Mg, and K metal clusters using synchrotron radiation-based x-ray photoelectron spectroscopy. The core levels for which the response from bulk and surface atoms can be resolved are probed over an extended binding energy range to include the plasmon loss features. In all species the features due to fundamental plasmons are identified, and in Na and K also those due to either the first order plasmon overtones or sequential plasmon excitation are observed. These features are discussed in view of earlier results for planar macroscopic samples and free clusters of the same materials.
authors.affiliation: Department of Physics and Astronomy, Uppsala University, Box 530, Uppsala, Sweden. Tomas.Andersson@maxlab.lu.se
authors.forename: T
authors.initials: T
authors.lastname: Andersson
authors.forename: C
authors.initials: C
authors.lastname: Zhang
authors.forename: A
authors.initials: A
authors.lastname: Rosso
authors.forename: I
authors.initials: I
authors.lastname: Bradeanu
authors.forename: S
authors.initials: S
authors.lastname: Legendre
authors.forename: S E
authors.initials: SE
authors.lastname: Canton
authors.forename: M
authors.initials: M
authors.lastname: Tchaplyguine
authors.forename: G
authors.initials: G
authors.lastname: Öhrwall
authors.forename: S L
authors.initials: SL
authors.lastname: Sorensen
authors.forename: S
authors.initials: S
authors.lastname: Svensson
authors.forename: N
authors.initials: N
authors.lastname: Mårtensson
authors.forename: O
authors.initials: O
authors.lastname: Björneholm